| Tail Number / N-Number | N66MW |
| Manufacturer | WHIDDEN MARION HULEN |
| Model | RV-4 |
| Year Built | 1994 |
| Manufacturer's Serial Number | 2766 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | 0-320 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | WHIDDEN MARION H |
| Street | 13476 SW 144TH PKWY |
| City | OKEECHOBEE |
| State | FL |
| Zip Code | 34974-8805 |
| Region | Southern |
| County | Okeechobee County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1994-11-15 |
| Certificate Issue Date | 1994-01-11 |
| Last Action Date | 2021-11-23 |
| Expiration Date | 2029-04-30 |
| Status | Valid Registration |
| Mode S Code | 52131410 |
| Mode S Code Hex | A8B308 |